Re: [RFC] dt-bindings: gpio: brcm,kona-gpio: convert to YAML

[Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>]

On 28/07/2023 21:20, Stanislav Jakubek wrote:
> Convert Broadcom Kona family GPIO controller bindings to DT schema.
> 
> Changes during conversion:
>   - add used, but previously undocumented SoC-specific compatibles
> 
> Signed-off-by: Stanislav Jakubek <stano.jakubek@xxxxxxxxx>
> ---
> RFC since dt_binding_check is giving me these errors/warnings:
> 
> Documentation/devicetree/bindings/gpio/brcm,kona-gpio.example.dts:21.23-34.11: Warning (interrupts_property): /example-0/gpio@35003000: Missing interrupt-parent
> 
> The old txt bindings and all current DTs do not use interrupt-parent AFAICT,
> so I'm not sure what to do about that.
> 
> Documentation/devicetree/bindings/gpio/brcm,kona-gpio.example.dtb: gpio@35003000: interrupts: [[0], [106], [4], [0], [115], [4], [0], [114], [4], [0], [113], [4], [0], [112], [4], [0], [111], [4]] is too long
> 
> Here I'm not even sure what the issue is.
> 
>  .../bindings/gpio/brcm,kona-gpio.txt          | 52 -------------
>  .../bindings/gpio/brcm,kona-gpio.yaml         | 77 +++++++++++++++++++
>  MAINTAINERS                                   |  2 +-
>  3 files changed, 78 insertions(+), 53 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/gpio/brcm,kona-gpio.txt
>  create mode 100644 Documentation/devicetree/bindings/gpio/brcm,kona-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/brcm,kona-gpio.txt b/Documentation/devicetree/bindings/gpio/brcm,kona-gpio.txt
> deleted file mode 100644
> index 4a63bc96b687..000000000000
> --- a/Documentation/devicetree/bindings/gpio/brcm,kona-gpio.txt
> +++ /dev/null
> @@ -1,52 +0,0 @@
> -Broadcom Kona Family GPIO
> -=========================
> -
> -This GPIO driver is used in the following Broadcom SoCs:
> -  BCM11130, BCM11140, BCM11351, BCM28145, BCM28155
> -
> -The Broadcom GPIO Controller IP can be configured prior to synthesis to
> -support up to 8 banks of 32 GPIOs where each bank has its own IRQ. The
> -GPIO controller only supports edge, not level, triggering of interrupts.
> -
> -Required properties
> --------------------
> -
> -- compatible: "brcm,bcm11351-gpio", "brcm,kona-gpio"
> -- reg: Physical base address and length of the controller's registers.
> -- interrupts: The interrupt outputs from the controller. There is one GPIO
> -  interrupt per GPIO bank. The number of interrupts listed depends on the
> -  number of GPIO banks on the SoC. The interrupts must be ordered by bank,
> -  starting with bank 0. There is always a 1:1 mapping between banks and
> -  IRQs.
> -- #gpio-cells: Should be <2>. The first cell is the pin number, the second
> -  cell is used to specify optional parameters:
> -  - bit 0 specifies polarity (0 for normal, 1 for inverted)
> -  See also "gpio-specifier" in .../devicetree/bindings/gpio/gpio.txt.
> -- #interrupt-cells: Should be <2>. The first cell is the GPIO number. The
> -  second cell is used to specify flags. The following subset of flags is
> -  supported:
> -  - trigger type (bits[1:0]):
> -      1 = low-to-high edge triggered.
> -      2 = high-to-low edge triggered.
> -      3 = low-to-high or high-to-low edge triggered
> -      Valid values are 1, 2, 3
> -  See also .../devicetree/bindings/interrupt-controller/interrupts.txt.
> -- gpio-controller: Marks the device node as a GPIO controller.
> -- interrupt-controller: Marks the device node as an interrupt controller.
> -
> -Example:
> -	gpio: gpio@35003000 {
> -		compatible = "brcm,bcm11351-gpio", "brcm,kona-gpio";
> -		reg = <0x35003000 0x800>;
> -		interrupts =
> -		       <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH
> -			GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH
> -			GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH
> -			GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH
> -			GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH
> -			GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
> -		#gpio-cells = <2>;
> -		#interrupt-cells = <2>;
> -		gpio-controller;
> -		interrupt-controller;
> -	};
> diff --git a/Documentation/devicetree/bindings/gpio/brcm,kona-gpio.yaml b/Documentation/devicetree/bindings/gpio/brcm,kona-gpio.yaml
> new file mode 100644
> index 000000000000..9d0b0a1af832
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/brcm,kona-gpio.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/brcm,kona-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom Kona family GPIO controller
> +
> +description:
> +  The Broadcom GPIO Controller IP can be configured prior to synthesis to
> +  support up to 8 banks of 32 GPIOs where each bank has its own IRQ. The
> +  GPIO controller only supports edge, not level, triggering of interrupts.
> +
> +maintainers:
> +  - Ray Jui <rjui@xxxxxxxxxxxx>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - brcm,bcm11351-gpio
> +          - brcm,bcm21664-gpio
> +          - brcm,bcm23550-gpio
> +      - const: brcm,kona-gpio
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1

As Linus pointed out, you do not have one interrupt. Put here the widest
constraints (min/maxItems) and narrow it per each variant in
allOf:if:then:. Also fix the syntax in example. Each interrupt is in its
own <>.


Best regards,
Krzysztof